Click radio button label
Click radio button label

The 'choose' function is the one that generically clicks radio
buttons, so I've updated it to always click the label where it
is used by the @brief-response test.

There's a few more `choose` and `check` functions in this file,
but they aren't needed to run the brief-response tests.

alphagov/digitalmarketplace-functional-tests,alphagov/digitalmarketplace-functional-tests,alphagov/digitalmarketplace-functional-tests